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

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This legendary urban waterfall creates a dazzling display of rainbows.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

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

All of Chicago's wood-paved streets are long gone but two alleys remain.

A science teacher's dream.

An enormous park-like oasis, full of famous Chicagoans' graves.

2300-year-old Roman road connecting the empire.

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

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The walls and streets of the ancient city are peppered with penises.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

An antiquated German apothecary on Chicago's North Side.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

35,000 grape hyacinths flow like water down a garden hill.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

A sharp sculpture made of thousands of pieces of jagged glass.