Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A floating cat sanctuary on an Amsterdam canal.

This unattributed sculpture in Amsterdam is hiding in plain sight.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

These ornate arches show how the course of the River Thames has changed.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

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

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A famous burial ground with a history both grim and literary.

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

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Hear the quietest sound from across the dome.

A little slice of Japan and its aesthetics in London's Holland Park.

An unusual round church in London with a Templar past.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.