This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Grandpa Rainbow felt the neighborhood needed some color, so he picked up a paintbrush and went to work.

It's always summer at the beach inside this former airship hangar.

This structure among the trees was the result of divine inspiration.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

A Chinese mining company has created the world's first cloned village in this perfect recreation of an Austrian town.

In this tiny Iranian town playing on the roof isn't just encouraged, it's the only place to go.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Housing a morgue, rare and confiscated weapons, and autopsy remains, the Vancouver police museum displays the dark side of Canada.

A deadly ancient portal to the underworld.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

This dangerous-looking suspension bridge may have been too unstable to remain open.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Monasteries on rock pillars, once accessible only by frayed ropes.

This tiny island protects a number of rare bird species by only allowing visitors to set foot on the beach.

This historic stone bridge has an entire neighborhood clinging to its sides.

Starting with nothing more than discarded conch shells, one man has built an island/bar that would make Jimmy Buffet jealous.

Impossibly life-like natural history models created out of glass by a father and son.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.