Romania's triumphal arch looks out over Bucharest.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A medieval church built up to defend its village.

A giant portrait of an ancient king looms over the river.

A Roman monument to their own civil engineering prowess.

This ancient theater was once the home of fierce gladiatorial battles.

Famous landmarks and structures from across Italy fill this miniature park.

The world's most active stratovolcano is almost always erupting.

Every inch of this chapel is covered in craftsmanship from across the world.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

Italian cave with exceptional acoustics and an unsavory history.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

A natural wonder in south Denmark.

The ruins of a monastery where Saint Bridget of Sweden had her revelations recorded.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Rare karst landscape eroded from a flat seabed.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

Come for the springs; stay for the mud bath.

Hundreds of unusual wheel crosses poke above the earth in this small Estonian cemetery.

The gutted remains of this Estonian mansion are a monument to a tragic love.