The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

The winter home of millions of migrating monarch butterflies.

Mexico's astounding mummy museum with "the world's smallest mummy."

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

These azure waters were thought to lead to the Mayan Underworld.

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

A gargantuan crystal kingdom.

This beautifully deceptive waterfall is something far different from what it appears to be.

Tucked along a river are enigmatic stone carvings created thousands of years ago.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Walk through a restaurant's refrigerator door to reach this hidden bar.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.