This Massachusetts home was the first to have a telephone line and its own phone number: 1.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The largest collection of historical roller skates in the world.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

The world's longest and deepest train tunnel.

A striking 12th-century-style castle built on the edge of a cliff.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A museum in the former home of Marxist revolutionary Leon Trotsky.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

A theme park featuring a replica of Noah's Ark built to the measurements specified in the Bible.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

This 220-year-old house is a reminder of New York City's Dutch past.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

A failed utopia, shut down by a more legitimate nation.

The entire length of the border is marked by a 20-foot-wide slash through the trees.