These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

This set of hot springs also comes with fantastic views.

It was once used as a classroom to teach mining skills to local high school students.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

The world's longest known cave system.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

This beautiful train graveyard is one of the largest collections of steam locomotives in the Mediterranean and Europe.

One of the most exquisite Lycian hilltop citadels in Turkey.

Ottoman-era houses lovingly preserved.

This amazing ancient cave was kept secret for seven years to protect it from the public.

You can row a boat through this ancient underground reservoir.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

A 300-foot-long Cold War submarine floats in a Chilean River as a maritime museum.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

A beautiful deserted greenhouse in the middle of a park.

A fantastical group of cliffside stairways, bridges, and twisting paths carved out of stone provide a surreal coastal hike.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

This expansive bridge in the Canadian wilderness was originally just built for friends.