Largest Roman Catholic church in North America.

There's a crumbling old mansion inside the Smithsonian National Zoo.

The oldest continuously operating fish market in the United States.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This grand gothic brewery has been pumping out suds for over a hundred years.

The Boston square dedicated to the dark poet who was born nearby.

Dim sum, served in a grand old theater.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

This concrete residential area doubles as an open-air gallery.

Reminders of the Battle of Berlin still scar the railway.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

This curious sculpture represents the perseverance needed to take to the skies.

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

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

Super-heavy Nazi architectural experiment.

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Inside this clubhouse is a cinephile's paradise.

A monthly street "service" of handmade puppets and live original puppets, whose devotees profess has the power to change lives.

These two monoliths have stood at the entrance to the neighborhood since the days it was called "Hollywoodland."

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

A Bicycle Path in the Sky.