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

The final resting place of soldiers' loyal canine companions.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The world's longest known cave system.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

It houses the remains of a 17th-century version of the Titanic.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

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

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

A bit of retro transportation flair preserved in the world's largest department store.

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The "Seinfeld" diner.

Elevated freight railway turned wildly successful urban park.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

A miniature view of the park, caught in time.

This Indiana walk of fame honors music legends with record-shaped plaques in the pavement.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

A medical facility that has been kept frozen in time.