The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

A hidden three-foot-wide house separates these two regal churches.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The stunning interior of this Gothic church is covered in ornate gold details.

Ancient catacombs form the foundation for this Rococo orgy of a church.

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

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

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

A garden in Lisbon filled with giant porcelain creatures.

The last bastion of Roman presence north of the Alps looms over a German town.

An ancient iron pillar in Delhi that seems to be rustproof.

Temples adorned with intricate, erotic sculptures make up one of the "seven wonders" of India.

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

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

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Human ancestor’s 3.6 million year-old footprints.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.