This massive subterranean fissure is known as the "underground Grand Canyon."

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

A whimsical bridge adorned with decorative dragons.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

Romania's only crater lake with water as pure as if distilled.

Heralded as one of the prettiest castles in all of Czechia.

A spherical "micro-nation" in the heart of Vienna.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

This unassuming passageway played a key role in one of the most important events in U.S. history.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A super-sized promotional trick that is now a D.C. landmark.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The site of the climactic scene from the classic horror film is now a historic landmark.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Elevated freight railway turned wildly successful urban park.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

The largest fountain in Bratislava.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.