Northern Ireland's Brobdingnagian stepping stones.

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

These barriers stand as stark reminders of Northern Ireland's troubled past.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

This Australian beach is composed of tiny shells.

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

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

During World War II, this rice mill became a Nazi concentration camp.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.