The oldest continuously operating fish market in the United States.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Dedicated to the man who created the first radio wave communication system.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A crumbling hospital from the 1850s on Roosevelt Island.

A rusted metal giant pays tribute to Birmingham’s industrial past.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A Circus legend leaves an unexpected endowment.

A giant Troll lurks under one of Seattle's oldest bridges.

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

A museum dedicated to the history and exploration of both popular music and science fiction.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

This former coal gasification plant found a curious second life as a popular public park.

This painted blacktop brings the classic arcade game to life.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Portugal's National Pantheon has a history of curses, collapses and financial problems.