Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

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.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

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

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

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

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

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

Perhaps the most scandalous statue of America's first president.

The national park was once a plantation estate.

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

A celebrity from the late Cretaceous period.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

It was once the base for a series of domestic terror attacks.

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.