World Best Underground: Waitomo Glow worm Caves
The Waitomo Glow Worm Caves attraction is a cave at Waitomo on the North Island of New Zealand, known for its population of glowworms, Arachnocampa luminosa.
These glowworms are found exclusively in New Zealand and are around the size of an average mosquito. This cave is part of the Waitomo Caves system that includes the Ruakuri Cave and the Aranui Cave.
Top 10 Underground: Canal Saint-Martin
The Canal Saint-Martin is a 4.5 km long canal in Paris. It connects the Canal de l'Ourcq to the river Seine and runs underground between Bastille (Paris Métro) and République (Paris Métro). The entrance of the canal is a double lock near the Place de Stalingrad.
Then, towards the river Seine, the canal is bordered by the Quai de Valmy on one side and the Quai de Jemmapes on the other. The canal widens at Bassin de la Villette, the largest artificial lake in Paris, and finally ends at the Seine via the Port de l'Arsenal.
Number 9: Fremantle Prison’s Tunnels
Fremantle Prison is a former Australian prison located in The Terrace, Fremantle, in Western Australia. The 6-hectare (15-acre) site includes the prison, gatehouse, perimeter walls, cottages, tunnels, and prisoner art.
The prison was built by convict labour in the 1850s, and transferred to the colonial government in 1886 for use as a gaol for locally-sentenced prisoners. It closed as a prison in 1991 and reopened as a historic site. It is now a public museum, managed by the Government of Western Australia with daily and nightly tours being operated. Some tours include information about the possible existence of ghosts within the prison.
Number 8: Caves of the Thousand Buddhas
The Mogao Caves or Mogao Grottoes also known as the Caves of the Thousand Buddhas form a system of 492 temples 25 km southeast of the center of Dunhuang, an oasis strategically located at a religious and cultural crossroads on the Silk Road, in Gansu province, China.
The caves contain some of the finest examples of Buddhist art spanning a period of 1,000 years.
Number 7: Wieliczka Salt Mine
The Wieliczka Salt Mine is located in the town of Wieliczka in southern Poland. The mine, built in the 13th century, produced table salt continuously until 2007, as one of the world's oldest salt mines still in operation.
The mine's attractions include dozens of statues, three chapels and an entire cathedral that has been carved out of the rock salt by the miners. The oldest sculptures are augmented by the new carvings by contemporary artists.
Number 6: Ainsworth Hot Springs
In the heart of the Kootenay wilderness is the tiny village of Ainsworth Hot Springs, set into the mountainside overlooking the vast expanse of Kootenay Lake and the Purcell Mountains.
The village is the location of the Ainsworth Hot Springs Resort, whose natural hot springs feature a unique horseshoe-shaped cave where the darkness, the mineral deposits and the humidity all combine to offer an exhilarating experience.
Top 5 list Best Underground World : Colosseum Hypogeum
The third tier of the stands has been opened, after the first session of restoration, which gives us back almost the full perception of the landmark. The ability to access to the upper ring is essential to understand the relationship between the Coliseum and the wide monumental area of the Forum, the other monuments of imperial Rome as well as the whole urban network.
Number 4: Montreal's Underground City
Montreal's Underground City is the set of interconnected complexes (both above and below ground) in and around Downtown Montreal, Quebec, Canada.
It is also known as the indoor city (ville intérieure), and is one of the largest underground complexes in the world. With over 32 km (20 mi) of tunnels spread over more than 12 km2 (4.6 sq mi), connected areas include shopping malls, apartment buildings, hotels, condominiums, banks, offices, museums, universities, seven metro stations, two commuter train stations, a regional bus terminal and the Bell Centre amphitheatre and arena.
Number 3: Seattle Underground
The Seattle Underground is a network of underground passageways and basements in downtown Seattle, Washington, United States that was ground level at the city's origin in the mid-19th century. After the streets were elevated these spaces fell into disuse, but have become a tourist attraction in recent decades.
Top 2: Subterranean River National Park
The Puerto Princesa Subterranean River National Park is located about 50 kilometres (30 mi) north of the city centre of Puerto Princesa, Palawan, Philippines.
The river is also called Puerto Princesa Underground River. The national park is located in the Saint Paul Mountain Range on the northern coast of the island. It is bordered by St. Paul Bay to the north and the Babuyan River to the east.