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

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.

Medicinal spa created with the discharge from a geothermal energy plant.

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

An important landmark in the history of algebraic logic.

A retired military stronghold on the rolling green coast of Donegal.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

This ancient Irish landscape boasts hundreds of legendary ruins.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

The oldest licensed distillery in Ireland.

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

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

A moody and picturesque riverside ruin overgrown with vegetation.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

There must be a pun in this haystack somewhere...

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Avoid gangster interaction while window-shopping.