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

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

This historical Netherlands fortress still bears the marks of its single siege.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The attic of a four-century-old canal house hides a clandestine church.

Museum preserving torture methods from the past.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

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

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This subterranean necropolis holds three floors of antler-dug grave caves.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

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

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Europe’s oldest natural human mummy.

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

Pompeii's less famous neighbor is still revealing her secrets.

Largest illuminated advertisement sign in the world.

This futuristic German television spire is actually the world's largest digital clock.