Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Puzzles within puzzles hide a golden treasure in this hedge maze.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

A permanent outdoor art installation made up of more than 100 mushroom-shaped lights.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

Every week, a festive public jam session breaks out in downtown Asheville.

The childhood home of the Wright Brothers in Dayton.

A museum dedicated to a unique ecosystem.

Formerly the most gerrymandered district in the U.S., it twisted and turned along racial borders.

The beams of the New College, Oxford dining hall come with an amazing story.

The stoic structure boasts a whimsical set of stained glass art commemorating Lewis Carroll.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The "lovely red Vega" of the legendary record-settling pilot.