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

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

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

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

London's smallest police station is barely the size of a phone booth.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

2300-year-old Roman road connecting the empire.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The world's oldest bookshop still in operation.

Hear the quietest sound from across the dome.

An incarceration museum on the spot of possibly the oldest prison in England.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The largest earthwork effigy in the world.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The trials and tribulations of marking Poe’s grave.

The curios of pharmacist and collector Henry Wellcome.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

An unusual round church in London with a Templar past.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.