A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

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

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The oldest Hindu temple complex in Nepal serves as the seat of Nepal’s national deity, Lord Pashupatinath.

This historic square in Nepal is home to temples dating back to the third century.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This elegant neoclassical garden is a peaceful oasis in the middle of the Nepalese capital.

Sacred Buddhist home of some spiritual monkeys.

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

This mundane post marks the old location of the city's main postal hub.

This was once a hall in which a 16th-century royal banquet was hosted by King James VI of Scotland.

A six-ton wedding present for the King of the Scots.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

The final resting place of soldiers' loyal canine companions.