Site of a classic 19th-century physics experiment to prove the earth is rotating.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

This innocuous-seeming building is actually the remnant of a major wartime brothel.

Marie Antoinette and Napoleon Bonaparte were fans of this 200-year-old French chocolatier.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

The celebrated eyesore created by starry-eyed sweethearts.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

An unusual number plate signifies the building's saucy past.

This 18th-century sundial was designed to calculate the date of Easter each year.

This bridge was constructed from the rubble of the infamous Bastille.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

This 85-foot-long table is made from a single slice of an old-growth Douglas Fir.

Contractors in this Oregon town have been stamping their names in sidewalks since 1908.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

When ecosystems collide in the arid Southwest.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

These winged Maya figures are the subject of speculation and conspiracies.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.