As one of the world's largest hydroelectric dams this plant took two countries to get built.

A historic chapel filled with colorful murals and a colorful past.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

Have tea in a cemetery with a dazzling view of Istanbul.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

The eerie burnt-out remains of a prominent building where 30 protestors lost their lives.

A statue dedicated to the founders of communism.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

The deepest metro station in the world.

A medieval church built up to defend its village.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

A section of the long chain that blocked enemy ships from entering Constantinople.

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

An artistic tribute to the famous singer, just around the corner from where he was born.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

An unsanctioned shrine that sprung up outside the late singer's home is causing a stir in London's Highgate neighborhood.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

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