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

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

There aren't too many operational funiculars around, but Pittsburgh has two!

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

These five houses were built for the 1933 Chicago World’s Fair.

This historic drug store-turned-museum served an important role in the Civil Rights Movement.

This Hattiesburg museum honors Black Americans who have served in the military, highlighting homegrown heroes.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The stone labyrinth in this New Orleans city park was laid to symbolize healing in the wake of Hurricane Katrina.

La Cara del Indio honors the Taíno chief who fought bravely against the Spanish invasion of Puerto Rico.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

A massive museum preserving the United States culture and the home of Abraham Lincoln's sleigh.

An epic statue dedicated to the memory of the 9th and 10th Cavalry Regiments of the U.S. Army

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

A Victorian-style home known as the “Castle on the Hill.”

A memorial for the mustachioed record-setting runner.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Metro station with a claim to rock n' roll fame.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.