After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Structure built from the skulls of vanquished foes.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Stone age urban planning.

A misnamed well, with a deep dark past.

Largest necropolis in the Mediterranean.

Breathtaking and huge 430 year old maps of Italy.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A Nesting Doll of Churches.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Two women with a flair for both adventure and artful clutter created this singular round home.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.