At the center of London’s oldest roundabout stands an obelisk that was erected in 1771, but spent several decades elsewhere.

Visit the grave of a famous feminist author and the mother of Mary Shelley.

An archway adorned with vulnerable flora and fauna.

Several colorful mosaic panels depict the life and creative genius of the Master of Suspense.

These stained-glass windows are all that remains of a building that was the target of one of the biggest explosions in London after World War II.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

This mysterious pyramid is said to be part of a complex web of occult and Freemason symbols.

Look up from the busy streets to discover how time is kept!

Its walls are adorned with exquisite murals of the natural world, transforming it into an ecologist’s Sistine Chapel.

An anti-tank graveyard in the English countryside.

One English town's celebratory landmark spurred more trouble than anticipated.

This vintage weapons display would be the perfect place for bibliophiles to hold out in a zombie apocalypse.

The ruins of a Roman fort lie in the shadows of an imposing medieval castle.

A meow-velous tribute to a beloved street cat, made famous on the internet.

The ornate miniature mansions were built for Istanbul's feathered residents.

The only Roman honorific column in Istanbul.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A marvel of Byzantine engineering under the streets of Istanbul.

The eclectic home of a leading Turkish architect is a gorgeous piece of eye candy.

One of the newest mosques in a city filled with thousands.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

This museum was invented in a novel before being made real by the author.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.