The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

The oldest continuously operating fish market in the United States.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

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

A nostalgic bibliographic gem.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

When ecosystems collide in the arid Southwest.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Roman ruins, natural methane fires and a lovely beach.

See massive fossils that are over 200 million years old in northeastern Arizona.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

The only recreation of William Shakespeare's indoor playhouse.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

A complicated contraption for telling time by the moon.

Walk through the history of American pop culture.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

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

A sulfuric hellscape in southern Italy.

Tropical paradise strewn with hundreds of World War II wrecks.