Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The final resting place of many of Germany's most famous communists.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

The only microgravity tower in Europe can produce nine seconds of weightlessness.

This giant, 83-year-old ship elevator is an engineering feat to behold.

Where a young athlete began his run across Canada after losing his right leg to cancer.

A statue of the second-tallest Dutchman in history.

A monument to the man who almost killed Hitler.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The ruins of the "20-year town" lay out among the mountains of Alberta.

The first park built over a freeway is a brutalist masterwork.

The colorful, smiling concrete silos of Vancouver.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

An imposing Omani fortress surrounded by date palm trees.

Canada’s surprisingly controversial monument to Dwight Eisenhower.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Two giant painted cooling towers make for one of the world’s most epic bungee jumps.