This fascinating abbey is considered the oldest monastery in the region.

A reconstruction of a classic mansion on the island of Delos was designed for a historian and archaeologist.

The home where the famous astrologer wrote some of his most telling prophecies.

A long strip of fossil-filled limestone makes up this natural bridge above a rushing stream.

Architectural monsters are devouring this palace's every door and window.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

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

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

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

Giant marble phalluses on the sacred island of antiquity.

This historic square in Nepal is home to temples dating back to the third century.

Sacred Buddhist home of some spiritual monkeys.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

This 16th-century monastery has been turned into a surrealist architecture compound.

Water and windows define this defensive Italian well.