Inside houses a vast collection of military aircraft and missiles spanning the ages.

A castle built by an eccentric medieval enthusiast in rural Ohio.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

Tucked in the back of this amazing antique store is an important piece of medical history.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A terrific purveyor of natural history objects and curios.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Try not to get slimed in Tribeca.

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.

Elvis's own personal tropical hideaway.

This two-room shotgun shack in Tupelo is the birthplace of a King.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

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

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The first KFC is on the National Register of Historic Places.

Inside, ancient treasures. Outside, modern contradictions.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

This magnificent Cincinnati graveyard is also a popular public park.

An abandoned relic of the city's failed experiment with below ground transit.