This man-made mound monument was built out of soil from all across the Polish empire.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

The 20-mile causeway that separates the Netherlands from the sea.

Made of 41,900 pieces of mosaic, it took two years to piece together this giant egg.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Real bones which are said to have belonged to a Polish dragon.

Remarkably preserved body discovered in a peat bog.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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

For one day every month Barcelona's Estació de França transforms into a market for model trains.

An eerie collection of the surviving structures from a past celebration of the future.

A statue of the second-tallest Dutchman in history.

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

Science meets wall art to highlight the beauty of famous mathematical equations.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

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

An underground city of salt.