The castle still holds traces of the abandoned Roman fort it was built atop.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

One of Ireland's most infamous prisons for rebels including men, women and children.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This museum is dedicated to the most famous Irish writers in history.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

This historic sunny-yellow building has an unfortunate connection to the sinking of the Titanic.

The time thousands of bags of chips washed ashore in the Outer Banks is memorialized in a local museum.

Perhaps the oldest vine in North America, this sprawling plant helps make a sweet wine.

The lesser-known lost colony of Roanoke was a safe haven for formerly enslaved people during the Civil War.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

One of the best places to see wild Colonial Spanish Mustangs in the United States.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

So many migrating birds roost on the bridge, it has a special summer speed limit.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A natural history museum with an extensive collection of bird dioramas.

What better place to take a seat?

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

A miniature city built by a single hunchbacked monk.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.