The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

This natural sea arch highlights Ireland's rugged coastal beauty.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

Horse cemetery on the grounds of Blarney Castle.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Elevated freight railway turned wildly successful urban park.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

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

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

A men’s restroom became a sandwich shop.