This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A priceless collection of the Nation's cryptologic history.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

The park is home to the United States's only still-operating Dutch windmill.

A charming remnant of 19th-century fishing towns sits on Michigan’s Leelanau Peninsula.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Former headquarters of the KGB.

Home of the future Emperors of Russia.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

A museum dedicated to controversial Russian pianist Alexander Scriabin.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

The tallest hotel in Europe.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

This massive monument honors the first human in space.