Carved fountains poignantly placed in parks and in front of special monuments.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

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

1513 Turkish world map, full of European state secrets and snarky commentary.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Giant marble phalluses on the sacred island of antiquity.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

Hideout of thieves, monks, and goat-footed gods.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

The ghost town where the villagers refuse to leave.

The hallucinogenic center of the ancient world.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

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

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Science fiction's grandfather has a fittingly marvelous tomb.

France's national museum of scientific and industrial instruments.

This massive library holds what was once the largest book collection in the world.

The vast, legendary catacombs hold secrets much stranger than stacked bones.