Museum dedicated to the terror regimes of Hungary.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Spain's largest bullring offers a unique glimpse at architecture and history.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

The world's largest wooden structure.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Legend says this sacred tree was a gift from goddess Athena.

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

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

This preserved village shows the modest lifestyles of the area's 19th-century Chinese gold miners.

Hundreds of bras, blowing in the wind.

The premier place to experience the Victorian imagining of the steam-powered future.

Highly spherical boulders on the shores of New Zealand.