This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

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

Romania's triumphal arch looks out over Bucharest.

Romania's only crater lake with water as pure as if distilled.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Enormous small-business mecca in the Midwest, serving dozens of artists.

The city is full of whimsical portals to another world.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

A terrific purveyor of natural history objects and curios.

Elevated freight railway turned wildly successful urban park.

An artist's cute bronze subway sculptures belie his violent artistic past.

The most confusing clock in New York.

A semi-scholarly approach to sex.