The oldest continuously operating fish market in the United States.

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

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.”

D.C. once had its own tiny rival to the New York Stock Exchange.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Northern Ireland's Brobdingnagian stepping stones.

Four hundred years ago, this turned-about message was carved into one of Winchester Cathedral's exterior walls.

This gravestone and its inscription inspired a movement that has spanned generations and saved countless lives.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

This pedestrian footbridge honors Pero Jones, an enslaved African who lived in Bristol.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This dazzling three-story shop showcases the art and history of music boxes, a popular novelty in Japan.

This historic castle is one of the oldest and most impressive in all of Japan.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

An enormous pair of straw sandals woven in the traditional way—to keep demons at bay.

An open-air museum exhibiting a total of 52 century-old buildings, recreating Hokkaido’s “pioneer village.”

Legend holds eating just one of these black eggs can add seven years to one's life.

The world's longest tunnel with an undersea section.

An eerie reminder to the horrors of World War II.