A mysterious castle built as a monument to lost love.

The fossilized remains of ancient California redwoods.

An unassuming grey box sitting on San Francisco's Pier 17 is a "sky diary" of the coastal city's temperamental weather.

A 1920s home transformed into an immersive art experience, where every room is a portal to another realm.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Overflowing with shipping containers, this location has been transformed into a massive workspace for artists.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The oldest stone house in Paris was built by its most famous alchemist.

A boutique perfumery fashioned to look like a Victorian-era shop.

This home on a quiet suburban street is completely covered with vibrant mosaics.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

A mysterious artist-run cabinet of curiosities and library.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.