This former boomtown "island" is now submerged below Folsom Lake.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

These etchings reveal the history of a long-gone quarantine site.

The cave where two British judges hid in exile after sentencing the king to death.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

An abandoned Depression-era zoo hidden just off the highway.

The world's largest egg has been cracked a number of times over the years but has been repeatedly replaced.

A geological mystery on Camelback Mountain.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

10,000 flowered plants bloom in the City of Roses.

It would take 35 firetrucks to fill this enormous glacial pothole.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

The only road through the heart of Glacier National Park.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

This sprawling bookstore spans four floors and has more than a million books in stock.

Step inside Lucy, the world's largest "elephant."

Books you don’t need in a place you can’t find.