There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

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

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

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

An ancient octagonal weather station named for the eight Greek gods of wind.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

This historic hotel invented the chocolate brownie.

An antiquated German apothecary on Chicago's North Side.

A speakeasy takes on Chicago's drinking culture.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The first AIDS memorial chapel in San Francisco and one of only a few in the U.S.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

Only hotel where you can legally launder money.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Golden Gate Park's historic collection of plants.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

Tiki luxury on Nob Hill.

San Francisco's newly reopened hands-on science museum.