A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

Giant topiary dog once played a role in a terrorist bomb plot.

Regency-era excess on the English Coast.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

The "Prussian Versailles" that is as glorious today as when it was built.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

Romania's triumphal arch looks out over Bucharest.

This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Quite simply the largest tree in the world (by volume).

The final resting place of a space program monolith, soon to be unveiled again to the public.

Mysterious 500-year-old tapestries depict a unicorn hunt.