Tubing through a cave lit with glowworms is a magical underground experience.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Thousands of well-dressed mummies below a monastery.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Pompeii's less famous neighbor is still revealing her secrets.

The longest hedge maze in the world.

A beautiful 62-acre Catholic shrine and botanical garden.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A hotel and restaurant serving as the mecca of kitsch.

A massive underwater sinkhole made famous by Jacques Cousteau.

A fiery crater has been burning in the Karakum Desert since 1971.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Continuing the tradition of the dime museum in style.

A submerged archeological park still holds the wonders of a Roman Sodom.

The atmospheric road was never meant to be so creepy.

Fine dining in the bizarre world of Lewis Carroll.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The seamy, underground secrets of Portland's criminal past.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A crumbling hospital from the 1850s on Roosevelt Island.