The fairy tale castle of the "fairy-tale king."

A small but immensely extravagant palace built by the "Night King."

Macabre astrological automaton clock dating to the late 1400s.

A fantastic castle rumored to be the birthplace of King Arthur.

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

This famous city eluded concrete detection until the early 2000's.

The amazing wonder cabinets of a very rich Austrian archbishop.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

Regency-era excess on the English Coast.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

This historic Australian bridge was built by convicts with giant stone spikes to prevent cattle from falling off the sides.

This historic observatory contains the world's oldest refracting lens telescope.

The bones of this aquatic dinosaur turned to opal over the centuries and the beast's remains were almost sold as jewelry.

Come for the flowers, stay for the bats!

The Victoria-era quarantine station for Sydney.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The spectacular history of spectacles on display.

A collection of biblical memorabilia.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A terrific purveyor of natural history objects and curios.

One of Australia's largest secondhand bookstores.

This massive water spout has been luring visitors for hundreds of years, some to their death.