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

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

Macabre astrological automaton clock dating to the late 1400s.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

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

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

The bears of Bern have been a city highlight for over 500 years.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

Caves famous for the dragon-slaying saint who lived there.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This striking, two-toned confluence of rivers is visible from space.

A beautiful opera house in the heart of Amazonia has recently restarted performances after a 90-year hiatus.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.

Once a meeting point for great thinkers, and the midpoint of the country.

The beautiful behemoth is one of the largest trees of its kind in the United States.

From Japan to Italy, this California park explores the world's cultures through their gardens.

Charnel house at the foot of Mount Sinai.

A basement full of treasures lies beneath this inn that has worn many hats throughout its 140+ years.

One of the most elaborate displays of Jellyfish is on display at the aquarium.