Portugal's National Pantheon has a history of curses, collapses and financial problems.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Commemorating a unique medieval profession: men who collected feces.

An oversized, oddly designed pedestrian overpass has drawn comparisons to a commode for pachyderms.

A marvel of Byzantine engineering under the streets of Istanbul.

The tomb of the mythological founder of Padua is not hidden in some obscure crypt, but stands right in the middle of the city square.

Something's missing between the arcades of the Palazzo della Ragione in "the city of the three withouts."

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The oldest botanical garden in the world that technically isn't the oldest.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Stalactites and stalagmites in a beautifully lit cave.

This ancient city - home to nine civilizations - is soon to be buried under 200 feet of water.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Fantastic views and thousands of love locks.

A statue beloved by—and named by—the local townsfolk it represents.