This Estonian watchtower looks like a big tree with two giant bird nests on it, complete with a "golden egg."

Mysterious craters may have been home to an ancient cult.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A beautifully eclectic mix of architectural styles.

A charming beach town in Turkey captures all the colors of the rainbow.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

An abandoned bell tower in the middle of nowhere is the last testimony of a forgotten medieval village.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The venerated body of a 12th century saint is celebrated each year with the 'Race of the Candles.'

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

This building has a giant piercing through one of its corners.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

An ode to the washerwomen who called Pavia home.

This Renaissance square was at the center of Leonardo da Vinci's map, the first ichnographic ever.