This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The "lovely red Vega" of the legendary record-settling pilot.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The most decorated dog of World War I is preserved in the Smithsonian.

Dr Barnes' $25 billion private collection of art and arboretum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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.

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

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

World's largest Christmas store.

The city is full of whimsical portals to another world.

These grassy undulations on a stretch of University of Michigan campus aren't bad landscaping, they're art.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

100 massive sculptures in the Hudson River Valley.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.