This Western Australian mint was established during the height of the Australian gold rush.

Eighty million natural history specimens call this gargantuan museum home.

The longest and tallest aqueduct in Britain can actually be sailed across.

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

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

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

The world's first ice hotel is still one of the most elaborate and beautiful.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A whimsical bridge adorned with decorative dragons.

This massive subterranean fissure is known as the "underground Grand Canyon."

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This unique building in the main square stands out among the city's typically Baroque architecture.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

A narrow strip of land is home to the tallest migrating dunes in Europe.

The reconstruction of this prominent building fulfilled a long-written command.

This ornate church has survived Nazi and Soviet occupation, including a short stint as a Soviet-era gymnasium and cinema.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

3,000 market stands in five former Zeppelin hangars.

Erotic art covers the walls of the largest ancient pleasure palace.