This memorial was created by an Irish nurse who lived in New York City during 9/11.

These barriers stand as stark reminders of Northern Ireland's troubled past.

These murals stand as reminders to the troubled history of this Northern Ireland city.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

Iceland's only steampunk shop imagines a retro-futuristic world that never was.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

An encyclopedic collection of mammal penises.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Three columns of volcanic rock shoot out of the ocean.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

This natural wonder is disappearing at an alarming rate.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

A herd of colorfully painted bovine statues can be found in the middle of "cowtown."

Only six people can sit inside this delightfully quaint sanctuary.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This seaside production studio was built to film 'Titanic' and has been the wet set of choice for other Hollywood productions since.

These ancient monoliths make up one of the largest archaeological sites in Palau.

Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

The underground hideout of a Japanese soldier for whom World War II ended in 1972.

A beautiful waterway tucked in the corner of a power plant.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

Where hundreds of Japanese civilians committed suicide to avoid being captured by American soldiers during WWII.