The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

It was once the base for a series of domestic terror attacks.

There’s a hidden military meme engraved on the World War II Memorial.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A preserved college lock-up that recalls a clubhouse approach to discipline.

It's good luck to be mocked by this monkey.

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

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Giant topiary dog once played a role in a terrorist bomb plot.

Vibrant street art created with mixed media.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

American soldiers discovered Europe's best one-liner at the end of World War II.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

This funeral home had the honor, if that is the correct word, of hosting the funeral of the famous Sacco and Vanzetti.

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

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

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.