Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

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

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

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

The oldest licensed distillery in Ireland.

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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

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

This single room has survived the centuries with almost no deterioration.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

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

The ancient tomb acts as a calendar that keeps perfect time.

A small 12th-century temple surrounded by waters believed to have curative properties.

This impressive clifftop temple was once at the center of an international custody dispute.

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

This giant glowing "beanpole" adds much-needed pops of color to an otherwise drab power plant.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.

The "Prussian Versailles" that is as glorious today as when it was built.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.