Robots, lasers, and whoopee cushions, oh my!

This cave holds a surprisingly colorful variety of geological oddities.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

One of the oldest and tallest lighthouses still in service on Lake Michigan.

Strange physical sensations and optical contradictions keep visitors coming back for more.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.

A luxuriant botanical garden below sea level.

A circus legend leaves an unexpected endowment.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

This shop also boasts some sweet memorabilia from "Willy Wonka and the Chocolate Factory."

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

The only dome home to be owned or occupied by dome inventor Buckminster Fuller.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

A mysterious castle built as a monument to lost love.

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

A wonderfully curated used bookstore in an airport.

Statue dedicated to the star of an old television show.

A unique botanical garden housed in three giant geodesic domes.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.