A relic of Victorian grandeur hides beneath a busy South London road.

The remains of Crystal Palace Great Exhibition of 1851.

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

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A ghost town originally established and governed solely by Black Americans seeking a place of their own, free from discrimination.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

An artistic tribute to the famous singer, just around the corner from where he was born.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A kaleidoscopic warehouse-maze of handmade neon signs.

Friendships have been forged over ham and eggs every Wednesday morning for nearly a century.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

This “living museum” at UCLA exhibits thousands of plant species from all over the world.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

A 300-ship graveyard, with a few still visible at low tide.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

A faux European lane smack dab in downtown L.A.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.