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

A Beaux-Arts triumph set to become Ford's innovation campus

The legendary building that needed ghostly approval before being built.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A hand-built folk art installation covered with messages of God's love.

America's only nuclear missile silo open to the public.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Take a monster truck tour around an ostrich farm in the middle of the desert.

See massive fossils that are over 200 million years old in northeastern Arizona.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A museum and tribute to a brave profession.

This rustic cabin, outfitted with gun slits, was once home to John D. Tewksbury, patriarch of the bloodiest family feud in American history.

A geological mystery on Camelback Mountain.

An urban laboratory.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Ruins of a once-prized railroad station in New York.

The seat of Buffalo government is a gorgeous Art Deco palace.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.