One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

A once-secret library of Freemason history in Catalonia.

A stately palace has been converted into the world's largest cannabis museum.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

A collection of full-size movie monsters opened to the public.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

The headquarters in Salem doubles as an occult art gallery.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

An unusual library of dead things at the Rhode Island School of Design.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

The remains of the first punk club in L.A.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

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

Medical and zoological curiosities for sale.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

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

World's largest collection of serial killer artwork and other macabre exhibits.