The second-largest collection of runic calendar staffs in Sweden.

The second oldest anatomical theater is housed in a museum of curiosities.

A large collection of ancient runestones decorates this university courtyard.

The world's largest model of our planetary system.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The world-record holder for the longest bridge stretching continuously over water.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

The world's longest and deepest train tunnel.

A science teacher's dream.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

Sports history, made in the Arroyo Seco.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

Frank Lloyd Wright died a year before construction on his largest public project even began.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Colorado Boulevard’s historic bookstore, operating since the bustling city of Pasadena was merely some orange groves and a few ostrich farms.

San Francisco's first World's Fair, dedicated to the wonders of California.

Concrete strongholds stand guard over the Golden Gate.

This giant temperature attraction created some giant electric bills.