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

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

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

A collection of biblical memorabilia.

Historic Hull Street was actually the first street with a proper name in the Boston area.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The site of Paul Revere's historic two lantern warning.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

This shallow cave got its name from copious amount of human bones found inside.

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

These sprawling mines once served as a source of plaster and today serve as a storage facility.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

The world's third-largest scale model of the planets.

The world's second largest rocking chair is found on Route 66 in Cuba... Missouri.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

An experimental, automotive replica of Stonehenge.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

A walk through the historic city center, under the streets of Seattle.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.