The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This once-derelict building is now one of the most beautiful bookstores in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The romantic botanic tunnel feels like a well-kept secret.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Stunning wetlands ablaze with pink lotus flowers.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An acoustic anomaly with a mysterious cause.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

New York's oldest magic store.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

A swing to dangle you off the very edge.

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

Countless grotesque faces stare out from this eerie Prague art wall.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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