This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Legend says this sacred tree was a gift from goddess Athena.

An ancient Greek monument and a Byzantine church coexist inside this cave.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A Byzantine-era church hidden in a wooded area below the Acropolis.

A unique housing complex born from the aftermath of the Greek Civil War.

Elaborate stone houses constructed from the ruins of war.

This graffitied 19th-century building was a prototype of European industrial architecture.

An ancient octagonal weather station named for the eight Greek gods of wind.

Savor sheep milk yogurt at the last of Athens' dairy bars.

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

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

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

No one knows who built this strange cave of worship or exactly why.

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

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

The Lund University's former gym houses a museum focusing on the creative process of art.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

This antique clock once gave the most accurate time in the area.

Swedish skyscraper with a 90° twist.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.