Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The house that took a plunge into the facade of a museum.

The Habsburgs' royal collections of art and wonders.

The topiary maze at the Habsburg hunting lodge.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Ozymandias’ time-keeping temple.

The final resting place of the great navigator, or maybe his brother.

Construction of Barcelona's iconic (but controversial) church is expected to be 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.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

An ancient Egyptian temple in the middle of Madrid, Spain.

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

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

A landscape decorated with enormous skull sculptures.

A moving memorial to the fallen and missing from WWI trenches.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.