A community farm in the midst of the Brooklyn concrete.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

This preserved wilderness hides the remains of a colonial grain mill used to feed George Washington's troops.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Reforestation in action is the main attraction in this abandoned quarry.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

An encyclopedic collection of mammal penises.

Three columns of volcanic rock shoot out of the ocean.

This stunning concert hall has become a symbol of Iceland's national recovery.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

Iceland's tribute to its thankless civil servants.

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

The return of something once considered a basic part of life.

A decommissioned military complex that's now a modern industrial park.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

The highest rapid transit station in the world.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.