A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

Tiny memorials honor individual victims of the Holocaust.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

A 12th-century fortress containing some of Berlin's oldest buildings.

An alchemist's "magic door" stands in the middle of a Roman park.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The hermit's humble home is hidden near the forested peak of Monte Marrone.

The stone walls of a home built to withstand a California wildfire still stand after more than a century.