The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

Stockholm's tiniest statue is of a small boy looking at the Moon.

A vintage penny arcade hidden in the back of a fun fair-themed bar.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Jule Körner's house full of bizarre architectural details.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

One of the oldest theaters in Australia, it's also said to be haunted by a performer who died on stage.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A collection of heirloom roses tucked in a spectacularly beautiful botanical garden on Lake Atitlan.

This is probably not the Target you're looking for.

A fearsome dragon clings to a corner of Munich's city hall.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

This old abandoned sign flickers to announce a motel that isn't even there.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

The only quarter of the Old City not dedicated to a major world religion.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

In the absence of a Chinese-language newspaper, for years the community posted daily updates on this simple bulletin board.

A fitting attraction for the corn capital of the world.

A roadside collection of over-sized iron creations that are a bit more macabre than most.