Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This circus town museum recognizes the outstanding clowns of history.

A bypass decorated with large wooden troll carvings.

A large circus museum with summer performances.

A theme park attraction designed to turn your children into LARPers.

More than 5,000 contemporary and "historic" mustards from around the world.

A bizarre house filled with an astounding array of collections.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

One person's lost luggage is another person's treasure.

This historic train station has been converted to a locomotive themed hotel.

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The pan man stands as a testament to the functionality of American cast iron cookware.