One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

A small but immensely extravagant palace built by the "Night King."

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Stroll through a wonderland of stupendous moss-covered trees.

This statue honors the author's groundbreaking family story.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones’ locker.

The oldest military monument in the United States.

Inside this Krakow church, an explosion of psychedelic color.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

The oldest skyscraper of Europe now stands dwarfed by the surrounding structures.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

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

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

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

World's largest barrel containing an inn.

A statue dedicated to the antihero of the Nibelung legend.

This 18th-century folly is one of Europe's rare "garden mosques."

In this German city center, the streets have no names.