Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

Exact replica of the ancient monument, but much, much lighter.

An original apothecary from 1792.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

This Pringle-shaped ledge makes for the perfect photo op.

A local landmark with generations of spraypainted messages, and more being added each day.

Just like the real 36th president of the United States, animatronic LBJ amuses visitors with jokes and stories.

A wealth of local folk art, antiques, and curios, without ever leaving your car.

For 150 years one family has been producing the iconic hot sauce on a bayou island made of salt.

About 80% of all U.S. avocados are descendants of Rudolph Hass's glorious tree.

The celebrity luchadores of La Paz are tough ladies in traditional petticoats and braids.

Trace the history of writing at this unusual North Carolina destination.

The unbelievably opulent home built for an infamous newspaperman.

At Macon’s oldest cemetery two members of Allman Brothers are buried side by side.

Visitors flock to see this church tower's unintended feature: It happens to resemble a giant chicken from multiple points of view.

A World War II officers' club features Old West murals painted by German POWs.

A luxuriant botanical garden below sea level.