Location of a reliquary containing bone fragments of 18 saints.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

A wild west land agreement was etched right onto this historic Idaho stone.

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A colorful architectural gem in Seattle’s uniquely modern Central Library.

A wall of chewing gum moonlights as collective art.

This working class sculpture pounds his hammer all the livelong day.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

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

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A historic arena where the Beatles played their first concert in the U.S.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.