This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A safe place for the wild donkeys of a hot vacation destination.

A sanctuary for sickly, stray, or wounded donkeys.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

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

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

A monument to the man who almost killed Hitler.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

One of the world's heaviest musical instruments towers within a popular urban park.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Berlin's old airport.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Cold war icon and onetime "hole" in the iron curtain.

An old department store turned Nazi prison turned artist commune.

It's always summer at the beach inside this former airship hangar.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

A slice of central Asia in the middle of Berlin.

Crushed coral and crystals give the sand its signature coloration.