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

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

Microscopic scenes; some call it novelty, some call it art.

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

This artificial cave looks like something out of a fairytale.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

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

Legend has it that seven Anglo-Saxon kings were coronated on this stone, located in the appropriately-named town of Kingston.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

The London statue that imitates passersby.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

A historic hill of tall tales, with one rather special tree.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

These morbid carvings remind churchgoers of the inevitability of death.

The last four extravagant street signs of London's historic banking street.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.