World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

This Oaxacan town is known for its colorful fantastical creatures hand-carved by local artisans.

This amazing collection includes rare stamps from around the world, including fluorescent ones.

The ruins of an abandoned church mingle with the graves at Oaxaca’s General Cemetery.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

This graveyard boasts a medley of diverse and imaginative funeral architecture.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

A trompe l'oeil mural remembers the original colonial building that once stood here.

This museum houses two of Mexico's most impressive Aztec monoliths.

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.

The oldest known metal-mining site in England dates back to the Bronze Age.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

These temples are among the oldest free-standing stone buildings in the world.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

This subterranean necropolis holds three floors of antler-dug grave caves.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.