Climb inside an iron crystal magnified 165 billion times its normal size.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A musical instrument played by the sea.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

Roman ruins top white travertine terraces formed by ancient hot springs.

Hundreds of people walk past this palm tree every day without spotting its secret.

This work of public art symbolizes the maritime history and the modern creative industry in Fremantle.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

Aqua white sand highlighted with fiery red rocks.

This historic Australian bridge was built by convicts with giant stone spikes to prevent cattle from falling off the sides.

Bronze statues honor the brave explorers who passed through this Antarctic gateway.

The world's only full-size replica of the research hut used by Douglas Mawson for his 1911-14 Australasian Antarctic Expedition.

This simple sailing boat is one of the oldest preserved fishing vessels of its kind in the world.

Countless expeditions have left Tasmania to explore Antarctica, but this island state has an even deeper connection with the sea.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

Elevated freight railway turned wildly successful urban park.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Visit an imposing 13th-century Transylvanian citadel lurking not far from the region's more heavily touristed attractions.

Romania's triumphal arch looks out over Bucharest.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.