Warsaw's fantastically preserved gasworks...almost.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A series of playful yellow penguins share a serious message about the environment.

An existential riddle in the world's largest ancient castle.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

A student driver's nightmare.

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

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

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

The commemorative stone column conceals a secret laboratory.

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

An architectural oddity hides in plain sight on this iconic London bridge.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

These ornate arches show how the course of the River Thames has changed.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

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

The sculpture of the deceased cockatoo flops atop its personal plinth.