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

An architectural oddity hides in plain sight on this iconic London bridge.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

This restored house is like a time capsule of the president's unconventional inauguration.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

Hear the quietest sound from across the dome.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The National Park Service’s best-kept secret with views that rival any in D.C.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

There’s a hidden military meme engraved on the World War II Memorial.

Home to items never before seen by the public.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Steadily reminding Czechia of its past.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Macabre astrological automaton clock dating to the late 1400s.

There has been an astronomical clock on this spot since the 14th century.

A dramatic coastline that’s home to a rare pine tree.