Featuring one of the oldest collections of historic musical literature in the world.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

An extraordinary collection of 18th century anatomical waxworks.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A sharply wedged sundial marks the point at which each day in the United States begins.

A barbarous band of serpents guard the bases of these Aztec temples.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The famous artist couple lived and worked here, in two different houses connected by a bridge.

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

A surreal statue honoring Prague's favorite literary son.

Macabre astrological automaton clock dating to the late 1400s.

It houses the remains of a 17th-century version of the Titanic.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Follow the original medieval paths that wind through this intriguing section of the city.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

A book bound in the skin of an infamous criminal, along with countless other specimens.

360° views of the city plus five floors of optical illusions and hands-on science.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.