Inside the cloister of the Temple of San Juan Bautista is a ceiling decorated with gold Baroque illustrations.

Frida Kahlo's childhood home, now a museum of her life and works.

Twelve natural mummies are displayed in the crypt of this former monastery school.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The only castle in North America to ever house European sovereigns.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The curious underground history of keeping Paris clean.

This 700-year-old street food market features baby octopus and soy donuts.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

People from around the world visit the shrine of Japan’s legendarily loyal dog.

Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

This Costa Rican topiary park is a surreal garden of unearthly delights.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Visit the monolithic tomb of America's most famous general.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.