Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

This Australian beach is composed of tiny shells.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A clear example of the process of erosion in action.

This extraordinary geological oddity resembles human-made pavement.

One of the best beaches in the entire world.

Alien rock formations grown from the sands of an Australian national park.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

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

The atmospheric road was never meant to be so creepy.

A museum marks and documents the site of the Titanic's launch.

Belfast's namesake river still winds below the city center, hidden from sight.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

It was once nicknamed "the most bombed hotel in Europe."

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The modern birthplace of Irish freedom.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

One of Ireland's most infamous prisons for rebels including men, women and children.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Two small markers remember the Alamo's feline protectors.