Tubing through a cave lit with glowworms is a magical underground experience.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This candy shop has been serving up sweets to the Louisville area since the 1850s.

Less a museum than a bizarre fantasy world created by artists and engineers.

This is not your typical jungle gym.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

A 20-foot-tall egg painted in a traditional Czech patterns by the Czech community in Wilson, Kansas.

The first home of the doomed aviatrix Amelia Earhart.

The face of the famed flier in a hillside in her hometown.

Massive still life just off the highway in Kansas.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

The headquarters of the famous Yale society.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

The world's largest public collection of PEZ memorabilia.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Yo, Adrian!