In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A beautifully eclectic mix of architectural styles.

Museum preserving torture methods from the past.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

An Art Nouveau building covered in animal gargoyles and grotesques.

When you've got to go, you've got to go.

This derelict superstructure was a very important warning system for the Soviet military.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

340-foot statue built to honour the Heroes of the Soviet Union.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This attraction was abandoned after the Chernobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This abandoned five-star hotel is now a five-star urban exploration destination.

Eighty million natural history specimens call this gargantuan museum home.

Black cat statues guard this temple-like Egyptian revival factory.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Catacombs turned marketplace.

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

A giant roundabout made up of six smaller roundabouts can befuddle the uninitiated.