The most accurate timepiece in the world.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Largest Roman Catholic church in North America.

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

The oldest continuously operating fish market in the United States.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

The site of the climactic scene from the classic horror film is now a historic landmark.

Home to items never before seen by the public.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

This iconic water tower and failed bandstand is open for panoramic views once a year.

One of two giant blue cockerel statues erected with an intentional double meaning.

Secret hideaway for an alternative beach experience.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

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

20,000 pieces in a Frank Gehry-designed building.

A tribute to Charles M. Schulz, who created the iconic cartoon that features Charlie Brown, Snoopy, and more.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.