Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

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

This grubby wall is said to be one of the Earth's esoteric energy centers.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This legendary city has been a tourist attraction for centuries.

These caves secretly held national treasures during World War II.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

The ruined doorway is a portal to the building's turbulent and torturous past.

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

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

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

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

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.