A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

South Korea's largely symbolic, barely used gateway to the North.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

The best place for scenic views of the DMZ and North Korea.

Buy your fish and have it cooked to order in this bustling, eight-floor seafood market.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

The Guardian of Tallinn.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

The topiary maze at the Habsburg hunting lodge.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A medieval church built up to defend its village.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A striking symbol of the Bulgarian capital.

These ancient rune stones plucked from the countryside now call this university park home.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Swedish skyscraper with a 90° twist.

Stockholm's narrowest alley is barely over two feet wide.