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

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

A modern day curiosity cabinet.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Quite simply the largest tree in the world (by volume).

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The private clubhouse for the members of the Academy of Magical Arts.

Resting place of Hollywood's immortals is also site of summer film screenings.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

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

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

Oldest building in California still in use.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.