This centuries-old mine remained hidden beneath a hotel bar until 2013.

One of the world’s largest cave systems houses legends, concerts, and wondrous rock formations alike.

The ruins of a former sanctuary for elite Aztec warriors.

These colonial murals are a fascinating hybrid of Spanish and Indigenous aesthetics.

This former hotel and casino was part of a paper mill operation that was one of Mexico's largest employers.

The site of a Japanese traders’ settlement that once thrived in Ayutthaya, if for less than a century.

One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

A monastery considered a state-protected cultural monument of exceptional importance, founded in the 14th century by Serbian King Stefan Dečanski.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

One of Mexico's rare urban natural parks features waterfalls and a working fish farm.

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

The former home of the famed revolutionary Pancho Villa is now a museum in his honor.

This colorful, ornately-decorated cemetery sits next to a quiet cove known as "the beach of the dead."

Located in the shadow of a volcano, this church is tied to the culture of the Purépecha people.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

This industrial Art Nouveau gem is a historic hotspot for Mexican counterculture.

Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

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