Watch cheese-flipping robots in action at this factory and museum.

A historic jail preserves etchings from over a century of incarcerated people in a town with a rough and tumble past.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

One of the best-preserved examples of an old town lock-up in the country.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

A beer pipeline runs beneath Bruges.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

The seventh largest spring in the world.

It's unclear what caused the fire that led to this opulent hotel's demise.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

A local pineapple cannery once dumped pineapple trimmings off of this pier, with sometimes smelly results.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

An unexpected sinkhole in a desert flat within Gold Butte National Monument.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

One of the oldest bridges in Norwich was used during the English witch trials and is said to be haunted.

A tree that defies gravity grows in an ancient ruin.

The oldest Naval chapel in the United States is home to an incredible collection of Tiffany stained-glass windows.

During World War II, Austria's oldest salt mine was used to store thousands of pieces of stolen artwork.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.