A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This bridge was constructed from the rubble of the infamous Bastille.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Five candy-colored villages on the Italian Riviera.

A lover's walk between hilltop towns, decorated with graffiti love notes.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Pompeii's less famous neighbor is still revealing her secrets.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Italian cave with exceptional acoustics and an unsavory history.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Every inch of this chapel is covered in craftsmanship from across the world.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Every equinox this Maya pyramid puts on a spooky ancient light show.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This ancient theater was once the home of fierce gladiatorial battles.