An alchemist's "magic door" stands in the middle of a Roman park.

A submerged archeological park still holds the wonders of a Roman Sodom.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Hear the tales of New York's most notorious criminals.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

One of the last Jazz Age "Wonder Theaters" in New York City.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Read a book next to a Midtown waterfall.

Elevated freight railway turned wildly successful urban park.

Former meatpacking facility turned vertical farm and sustainable business complex.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

The subtle science of a master molecular gastronomist.

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

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Giant marble phalluses on the sacred island of antiquity.

This famous archeological mystery may be an ancient example of movable type.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

The world's largest reflecting pool is just two centimeters deep.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.