This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

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

Today's aerospace industry can be traced back to one man and his gliders.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

A crumbling Beaux Arts monument to the Bay Area's age of rail.

Dive bar built out of the remains of a whaling ship.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

An overlooked and unassuming engineering marvel.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Human ancestor’s 3.6 million year-old footprints.

This rare volcano spews the strangest and (literally) coolest lava in the world.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

This black shoreline is made up of exploded lava particles.

Watch the newest land on the planet form before your eyes.

This legendary urban waterfall creates a dazzling display of rainbows.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

A controversial memorial at the place where Captain Cook met his violent end.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.