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

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

One of Jeff Koons’s largest sculptures and his first commemorative work.

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

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The narrowest street in Paris.

How did a French journalist’s grave become the sexiest statue in the cemetery?

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This modest marker near Notre Dame identifies the very center of Paris.

Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A mining camp built around an unexpected occurrence of silver.

A small oasis not far from downtown Moab.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

This alpine statue of Jesus in Silverton is said to protect both miners and local economies.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.