A magical oasis in the middle of the Negev Desert.

Enormous lake at the bottom of a unique cave system.

The smallest post office in the United States is no bigger than a broom closet.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

A historic dam made famous for its turbines and feature in a Hollywood classic.

This museum pays tribute to the Cherokee leader who created a written language for his people.

Some North Carolina Cherokee have been keeping their history alive for decades with a single play.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Mile-long cave system near Great Smoky Mountains.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

This holy goods emporium is where priests go for a little retail therapy to outfit their churches.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

This vast masterpiece of Moroccan architecture spreads across 20 acres.