Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

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

The site of one of history's most indelible and horrific tragedies.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A charming beach town in Turkey captures all the colors of the rainbow.

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins top white travertine terraces formed by ancient hot springs.

A Christian monastery stands on what was once a holy Incan temple.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

"Enter and be entertained or annoyed by Dada in Walla Walla."

This famous bridge twisted itself into oblivion, but not for the reason you might think.

This former coal gasification plant found a curious second life as a popular public park.

A walk through the historic city center, under the streets of Seattle.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The remains of the first saint from Alaska in the Russian Orthodox Church.

A unique set of caves that spits waves back out into the ocean.

A Hawaiian stairway to heaven—that you can't climb.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

Race through the maze, get your name on the sign.