Experience the glam side of air travel without leaving the ground at this speakeasy.

The "Seinfeld" diner.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

This massive statue of John Muir on the side of a California highway was carved from a redwood tree.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Exquisite irises bloom every spring in this hillside garden.

A quick journey through the history of Annapolis.

Drive up a paved road into "Nevada's Yosemite" for exquisite views and mountain hiking in an alpine setting.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A full-scale sculpture of a mermaid and baby grand piano hidden underwater by David Copperfield.

Two craters, which probably erupted within the last 1,500 years and are now filled by alkaline lakes, represent Nevada's youngest known volcanic activity.

Overlooking Puget Sound sits a garden with a Buddhist prayer wheel and an elaborate labyrinth.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens

Don't get it twisted: This is the oldest pretzel bakery in the United States.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The hallucinogenic center of the ancient world.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.