A geometric jumble of homes.

This nearly abandoned town was once a thriving mining community until a series of fires.

One person's lost luggage is another person's treasure.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

360° views of the city plus five floors of optical illusions and hands-on science.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Its buzzing collection honors vibrator history.

A 140-year-old castle with underground caves hidden in San Francisco.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A kaleidoscopic warehouse-maze of handmade neon signs.

A magical place that lets you play in and explore the world of Studio Ghibli.

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

Rippling sand dunes frozen in the Arizona rock.

This edible park is open to any and all foragers.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

This innocent-looking townhome is actually a subway exit.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Shop selling 500 flavors of soda has something for everyone.

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

This underground museum highlights the history of Mexico City's subway system.

This Mexico City subway station will make you feel like you've been transported to the London Underground.