The oldest housing complex in Riga is a mini timeline of architectural trends.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A hands-off space for graffiti artists to hone and display their skills.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Belfast's namesake river still winds below the city center, hidden from sight.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The remains of the oldest synagogue in Britain lay forgotten for seven centuries, hidden under a humble shop.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A former ironworks that was the first UNESCO industrial site.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The secret medieval communication system will whisk your words above the noise of the crowd.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

The stunning interior of this Gothic church is covered in ornate gold details.

This giant power line tower is a robot that can express its moods in neon.

A beautiful young girl said to have been buried alive in her coffin…

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.