A marvel of Byzantine engineering under the streets of Istanbul.

Turkish adventurer antiques in the heart of the Grand Bazaar.

Books you don’t need in a place you can’t find.

The site of Paul Revere's historic two lantern warning.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

An eccentric inventor's castle home with its own indoor weather system.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

At 207 feet, one of the world's longest continuous escalators.

9th century Abbasid mosque, damaged in modern warfare.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

"Try not to knock anything over!"

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One of the oldest living oak trees in the Southeast.