This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Shop the world's largest number of ice cream flavors, ranging from delightful to downright bizarre.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

This small museum tucked within a subway station holds pieces from Madrid's past.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

The morbid items in this small and hidden museum are not for the weak stomached.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

Historical figures from New York City's Catholic community reside in Midtown.

A celebration of capitalism in Midtown.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.