This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

This mile marker stands at the unofficial end of a highway built to defend the United States from a Japanese invasion during World War II.

A morbid gateway to an Alaska town prides itself on the hunting history it represents.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

World-famous, Pink's still manages to keep its prized cult fetish status.

An effigy of Vancouver's Gastown neighorhood's namesake.

Cascading outward, this waterfall creates the appearance of a flowing veil.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

Abandoned in 2009, this once popular resort destination now stands frozen in time.

Drink a Guinness under the wings of Reagan's retired Air Force One in his presidential library.

The colorful, smiling concrete silos of Vancouver.

A middle school sports field that many believe was the true location of the first successful powered flight - and not by the Wright Brothers.

The oldest continuously operating Catholic school west of the Mississippi.

Built in 1895, this bed and breakfast was once a hospital that served an early 1900s Gold Rush boomtown.

Hidden in a hotel parking lot is a strange historical plaque erected by an obscure fraternal society.

An abandoned lot littered with concrete debris was once the home of the world's first female railroad president.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

California's oldest wind harp represents a historic piece of America's Danish history.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

Historic psychiatric asylum and most-filmed location in the Great White North.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.