Places Edited by Archimedes

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Where Venice's gondolas go for a tune-up.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

A hugely vast Irish landscape of barren rock that stretches for miles.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

An ongoing medieval tradition of communal pig husbandry is honored with a handsome granite sculpture.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

An ancient neolithic tomb that only sees the sun twice a year.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

One of Ireland's most infamous prisons for rebels including men, women and children.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.