The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

The oldest public library in Ireland.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

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.

This glamorous old building is said to have inspired the Tower of Terror.

Each winter this underground cave forms a dazzling ice palace.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

A non-native grove of 241 redwoods in Southern California.

The unbelievably opulent home built for an infamous newspaperman.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

An inconspicuous footbridge beloved by San Diego locals.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Canyon walls shrouded in ferns.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Quite simply the largest tree in the world (by volume).

World-famous, Pink's still manages to keep its prized cult fetish status.

Towering basalt columns, a creation of fire and ice.