The last street in Pittsburgh that's paved with wood.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

A beautiful oddities shop crammed with strange and morbid curiosities.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

A small collection of magic tricks and memorabilia is now an apartment-sized museum.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

The library's graceful rotunda is like a bibliophile's temple.

The world's largest model of our planetary system.

An artist's mausoleum with a haunting echo.

Sweden's oldest animated sign is still lighting up the skyline today.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

It's always game time at Stockholm's only museum devoted solely to video games.

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.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.

This Stockholm light tower can be controlled by anyone with a smartphone.

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.