This ”skyspace,” which bears a resemblance to a spacecraft, is designed to disappear in the presence of light.

Hotel designed around a 16th century Mexican bullring.

The spectacular subterranean collection includes dazzling minerals, including a piece of "kryptonite."

This ornate church designed by a self-taught architect is an eclectic masterpiece in the heart of Central Mexico.

On a picturesque lake island, a massive, “broken” crucifixion has become a popular pilgrimage destination.

A hotel masquerading as a medieval castle overlooks a Mexican city.

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

Take in a sweeping views of Guanajuato—and save yourself a hike up a steep hill—on this funicular.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

The walls and ceilings of the "Mexican Sistine Chapel" are almost completely covered with mural, sculpture, inscriptions and oil paintings.

A beautiful example of 18th-century engineering still standing tall.

The winter home of millions of migrating monarch butterflies.

Climb through the life of a Mexican hero as you ascend a 130-foot statue.

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

Climb and walk into the crater of one of the youngest volcanoes on Earth.

Its collection features not only Christian-themed art but also works made by members of the clergy.

Monterrey's take on the "Speakers' Corner" was set up as an open space for freedom of expression in 1985

A honeycomb-like structure of interlocking shelves creates a beehive of books.

This lurid German fountain plots the sad course of marriage from dating to death.

The "Prussian Versailles" that is as glorious today as when it was built.

A strange rock formation with numerous legends trying to explain it.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

This giant glowing "beanpole" adds much-needed pops of color to an otherwise drab power plant.