One of downtown Berlin's last reminders of its Communist past.

Largely overlooked, this little fountain on Museum Island is a whimsical tribute to a Prussian king nicknamed the “Fatty Flounder.”

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

This public observatory is home to the "celestial cannon," the longest pointable telescope in the world.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This TV tower once secretly housed a GDR intelligence team.

The non-native bovine herd was brought in to help conserve these Berlin wetlands.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

Have a steam and some blini at this cafe in a century-old bathhouse.

The greatest real estate coup of all time.

During the holidays, a vintage subway train whisks New Yorkers back in time.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

An artist's cute bronze subway sculptures belie his violent artistic past.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Wine bottle sculpture with a ship's stateroom inside.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This innocent-looking townhome is actually a subway exit.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A living archive of urban activism and space reclaimed.

Once America's longest-manned military fort, now an abandoned hulk.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Bowl in splendor, if you're lucky.