Largest lake in Great Britain measured by surface area.

This Ukraine alleyway has become its own little island of forgotten things.

A Serbian church lit by chandeliers made of weapons.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A small town Romanian cemetery filled with darkly humorous gravestones.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

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.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

This massive underground salt mine now holds a sci-fi theme park in its depths.

A stunning 18th century pharmacy and medieval chemist's collection.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

Structure built from the skulls of vanquished foes.

A collection of items from a way of life that no longer exists.

A futuristic, brutalist masterpiece that is also strangely prison-like.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Where the lovelorn find a home for their sentimental keepsakes.

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A musical instrument played by the sea.

One of the world's oldest olive trees, thought to be over 2,000 years old.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.