What is left of the pillar of Saint Simeon, the voluntary martyr who climbed the column to give his sermons, remaining perched there for thirty-seven years.

Water and windows define this defensive Italian well.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Macabre astrological automaton clock dating to the late 1400s.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The world's second-largest sundial, made entirely out of stone.

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

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

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

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

A city built from mud and known as the "Manhattan of the desert."

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

Look closely and you’ll notice that the color changes a third of the way up the tower.