Places Los7key Wants to Go

The miraculous hydrant that saved the Mission District in 1906.

This print shop boasts one of the largest pinball arcades in San Francisco.

A hidden subterranean installation offers a view of the sky.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A psychedelic labyrinth on the San Francisco bay.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Tiki luxury on Nob Hill.

A wonderfully kitsch bookstore the size of a supermarket.

Lavish royal estate punctuated with heated greenhouses.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A slice of central Asia in the middle of Berlin.

The seamy, underground secrets of Portland's criminal past.

Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A floating cat sanctuary on an Amsterdam canal.

Banksy gives themself artistic license with this piece of London street art.

A tongue-in-cheek arcade where the games are based on everyday life.