Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

America's most famous piece of self-built architecture.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

Oakland's beautiful monumental cemetery.

A disciple of Frank Lloyd Wright built an experimental, partially underground home in the desert.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An urban laboratory.

This art shopping center still boasts pieces of its past as a textile factory.

Take in a sweeping views of Guanajuato—and save yourself a hike up a steep hill—on this funicular.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

This gravelly, dangerous highway is the only road in the United States that leads to the Arctic Ocean.

The northernmost truck stop in the United States.

The "Crow Boat" of Kootenay Lake, sold for a dollar and now on display as "the world's oldest intact passenger sternwheeler."

Spectacular views await visitors to this lake.

Population: three people, two dogs, and one old grouch.

This house was largely built out of hundreds of thousands of discarded glass embalming fluid bottles.

You might recognize this historic Oregon mansion from its appearance in 'The Goonies.'

A Roman-style column in Oregon hides a spiral staircase inside.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

An extraordinary collection of aircraft and spacecraft on display at the original site of the Boeing Company.