This medieval Italian town is a sheer (and beautiful) cliffside defense.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

An underexplored, 130-foot tropical waterfall that you will have all to yourself.

Iran's colorful terraces are a rare geological masterpiece.

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

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

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

A trading post in the North Pole where children send letters.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A hundred-year-old museum filled with giant physics toys and experiments designed by grad students.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

A concrete plant shaped like four giant soldiers commemorates one of the most decisive battles of the Napoleonic Wars.

A historic neighborhood church is reborn as a psychedelic arts collective.