Places Edited by Archimedes

One of Ireland's best-preserved chambered cairns can be found next to a wishing tree.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

The ruins of a monastery that dates to the 7th century.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

A Reformation-era fiery figurehead once denoted this location as a print shop.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

These murals stand as reminders to the troubled history of this Northern Ireland city.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

The ruins of a medieval monastery named after a type of tree.

A stunning Victorian abbey and walled garden on a lakefront.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

Medieval ruins nestled within a breathtaking swath of Spanish nature.

Follow the original medieval paths that wind through this intriguing section of the city.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.