A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

One of the last Jazz Age "Wonder Theaters" in New York City.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The celebrated eyesore created by starry-eyed sweethearts.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

This demon atop the Notre-Dame de Paris looks utterly bored.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

Saintly bones pressed into a wax effigy of a Catholic superstar.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A modern-day Lascaux cave underneath Paris.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

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