Have a seat with the father of modern computing at this Manchester monument.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The oldest inn in England served brew to the crusaders.

This 22-acre botanical garden is home to the largest collection of rhododendrons in the world.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An iconic Soviet statue of working-class people.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Gargantuan home of Russian science.

Moscow's imposing monument to the Space Age.

Former headquarters of the KGB.

Museum celebrating the achievements of the Soviet space program.

Immortal combat in a Moscow museum.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

The celebrated eyesore created by starry-eyed sweethearts.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

The video game-themed street art first popped up in the French city.