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Our philosophy is simple. We want to encourage you to dream. BIG! Then we help you plan your trip, get the most out of it while you're traveling and help you share your experience with friends.
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Duration: 5 hours
Price: $109.90
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Price: $958.15
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Explore Under the Ground
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Take Grand Avenue Tour, Mammoth Cave National Park, Kentucky
This physically demanding trip will give you an excellent idea of the size and complexity of the Mammoth Cave System. Learn of the cultural and natural history of the cave and how they are interwoven as your journey takes you through some of the most dramatic passages in this "mammoth" cave. Walk through a variety of cave as you encounter gypsum lined passages, narrow... -
Explore Great Basin National Park, Nevada
Great Basin National Park is a United States National Park established in 1986, located in east-central Nevada near the Utah border. The park derives its name from the Great Basin, the dry and mountainous region between the Sierra Nevada and the Wasatch Mountains. Topographically, this area is known as the Basin and Range Province. The park is notable for its groves o... -
Take Great Onyx Lantern Tour, Mammoth Cave National Park, Kentucky
Learn the legends and rumors of early community life as you travel by bus to Great Onyx Cave, a privately owned and operated cave until the 1960's. Discover how Great Onyx survived the Cave Wars and emerged as one of the most pristine show caves in the region. Exploring this geologic beauty by lantern light offers a different perspective to the multitudes of dripstone... -
Explore Great Siege Tunnels, Rock of Gibraltar
The Great Siege Tunnels in the British Overseas Territory of Gibraltar, also known as the Upper Galleries, are a series of tunnels inside the northern end of the Rock of Gibraltar. They were dug out from the solid limestone by the British during the Great Siege of Gibraltar at the end of the 18th century. The Great Siege was an attempt by France and Spain to capture G... -
Explore Green Grotto Caves, Jamaica
The Green Grotto Caves are show caves and a prominent tourist attraction in Discovery Bay, St Ann on the north coast of Jamaica. Named for the green algae that cover its walls, the structure of the cave is strikingly different to inland systems; the cave is a Flank Margin Cave (old mixing chambers at the edge of the fresh water lens with the sea water) with two well-d... -
Explore Gregory's Cave & Bull Cave, Great Smoky Mountains National Park, Tennessee
The fracturing and weathering of the limestone and sandstone in Cades Cove has led to the formation of several caves in the vicinity, the two largest of which are Gregory's Cave and Bull Cave. Bull Cave, at 924 feet (281 m), is the deepest cave in Tennessee. Trilobite and brachiopod fossils have been found in Gregory's Cave. Cades Cove is an isolated valley locat... -
Explore Grotta dello Smeraldo (Emerald Grotto), Conca dei Marini, Italy
The Grotta dello Smeraldo ("Emerald Grotto") is a cave, partly inundated by the sea and located in Conca dei Marini, Italy, on the Amalfi Coast. It is one of several caves worldwide, that is flooded with a brilliant blue or emerald light. The quality and nature of the color in each cave is determined by the unique lighting conditions in that particular cave. The grott... -
Explore Grotta di Ispinigoli, Sardinia
The Grotta di Ispinigoli is a karstic cave in the Supramonte massif, near Dorgali, Sardinia, Italy. One of the largest grottoes in the island, houses a large stalactite-stalagmite compound, the tallest in Europe and one of the tallest in the world, measuring some 38 m in total. The grotto also include the so-called Abisso delle Vergini ("Abyss of the Virgins"), a c. 6... -
Explore Gruta da Lapa Doce, Chapada Diamantina, Brazil
The entrance of the Gruta da Lapa Doce (Lapa Doce cave) landscape is amazing. There is a beautiful sinkhole just before the entrance of Lapa Doce. Once inside the stalactites and stalagmites are beautiful! You can only visit the cave of Lapa Doce with a local guide who accompanies the group on the Park headquarters. You must have closed shoes (which they rent if you... -
Hike Gruta das Torres Lava Tube, Pico Island, Azores
The Gruta das Torres (Grottoe of Towers), is a lava cave, a geological formation of volcanic origin formed from the flow and cooling of subterranean magma rivers. This formation is located outside the parish of Criação Velha, in the municipality of Madalena, on the western flanks of the island of Pico. The cave system formed from a series of pahoehoe lav... -
Visit Gruta do Carvão, São Miguel Island, Azores Islands
The Gruta do Carvão (Grotto of Coal) is an ancient lava tube located on the outskirts of the municipality of Ponta Delgada (in the civil parish of Santa Clara) on the island of São Miguel in the Portuguese archipelago of the Azores. It's part of the UNESCO Azores Geopark. Gaspar Frutuoso, the 16th century chronicler and historian wrote: Owing to its scie... -
Explore Guadirikiri Cave (Quadirikiri), Aruba
The Guadirikiri Cave (also known as "Quadirikiri") is notable for its two large dome-shaped chambers which are illuminated with sunlight through holes in the ceiling. Entry to the cave is at the base of the cliff. This 98-foot (30 m) long cave is also a nesting site for numerous small nocturnal bats, which are harmless. In order to preserve the natural habitat of the ... -
Visit Guanajuato & It's Mines, Mexico (UNESCO site)
Guanajuato is a city and municipality in central Mexico and the capital of the state of the same name. It is located in a narrow valley, which makes the streets of the city narrow and winding. Most are alleys that cars cannot pass through, and some are long sets of stairs up the mountainsides. Many of the city’s thoroughfares are partially or fully underground. ... -
Explore Gunung Mulu National Park, Borneo, Malaysia (UNESCO site)
Gunung Mulu National Park near Miri, Sarawak, Malaysian Borneo, is a UNESCO World Heritage Site that encompasses incredible caves and karst formations in a mountainous equatorial rainforest setting. The park is famous for its caves and the expeditions that have been mounted to explore them and their surrounding rainforest, most notably the Royal Geographical Society E... -
Visit Gýgagjá (Yoda Cave), Iceland
Gýgagjá or Gígjagjá Cave is better known as Yoda Cave.. It is located at the base of the southwestern slope of Hjörleifshöfði Hill in Iceland.
Price: $227.54