This unusual building straddles two countries.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A memorial for public executions that dates back to the 14th century.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

This top secret Chinese military megaproject is the world’s largest human-made tunnel structure.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

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

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

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

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

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

One of the oldest of its kind.