Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

An abandoned train station in Munich constructed for the 1972 Olympic games.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The celebrated eyesore created by starry-eyed sweethearts.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

Abandoned Italianate architecture on the coast of Maine.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

The world's largest rotating world.

The palatial McDonald's that inspired Wesley Willis.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

The famous author's birthplace is preserved in a town that he once described as narrow-minded.

Roses and other fascinating flora fill this garden built to commemorate Britain's immortal Bard.

To find the "unicorns of the deep" you've got to go downstairs.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

This modern arts center is built around a gem of late-Baroque architecture.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A little sculpture with a large wardrobe.