A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This chimerical bridge/tunnel appears to dead end right into the sea.

Budapest's Communist-era statues, banished to the suburbs.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The site of Paul Revere's historic two lantern warning.

Narrowest house in Boston.

Ice cream stand, snack bar, and time capsule of milk conveyance.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

An enormous, inside-out glass globe built in 1935.

This impressive Boston holy house is the American mecca for Christian scientists.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This innocent-looking townhome is actually a subway exit.

A working metal shop and venue for outrageous art and music shows in a former cannonball factory.

A big shiny gin and whiskey distillery in Sunset Park.

Once a ferry dock, radio transmitter, and now a new Greenpoint park.

A living archive of urban activism and space reclaimed.

Most prolific publishing house in the 1600s open to the public.

Cozy basement bar sports an inventory of over 2,000 beers.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

A little sculpture with a large wardrobe.

Detailed facade of a brownstone in Boerum Hill.