A cable-suspension footbridge that hangs high above the Mill River.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

Pick up a kebab and a credenza at this unique combination furniture store and café.

A 60-foot-tall tower provides unparalleled views of the southern Green Mountains.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

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

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

The former hotel where Tesla invented the radio.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

The home of Greece’s national poet sits crumbling in the middle of a popular tourist district.

This building displays the scars of the “Dekemvriana,” a dark time in modern Greek history.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

This Ottoman-era church is hidden amid a busy tourist area.

According to legend, this ancient column contains healing properties.