This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

Catacombs turned marketplace.

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Fossils, railroads, and waterfalls!

At 207 feet, one of the world's longest continuous escalators.

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Perhaps the most scandalous statue of America's first president.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

One of the oldest living oak trees in the Southeast.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This private residence was the template for one of the most beloved television homes of all time.

The island residents are known for taking their quirky sense of humor with them to the grave.

This natural wonder is disappearing at an alarming rate.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

Try the alligator at this fondue spot, which has been catering to "lovers and hedonists" since 1967.

The eccentric mansion of one of the most popular horror authors of modern times.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

The debris forms a solemn memorial to those who died in a 1963 accident.