There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

A scattered trail of street art adds a pop of color to the city's stark structures.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A very classy 1920s-era bar right in Grand Central Station.

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

A semi-scholarly approach to sex.

A giant Troll lurks under one of Seattle's oldest bridges.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Elevated freight railway turned wildly successful urban park.

A walk through the historic city center, under the streets of Seattle.

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

The final resting place of soldiers' loyal canine companions.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

One woman’s obsession gave birth to this lovely oddity at the Boston Public Library.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The site of Paul Revere's historic two lantern warning.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.