A forgotten underground railway once whooshed trams beneath London.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

One of the world’s leading and most extensive archives on the Holocaust, the Nazi era, and genocide, this collection includes published and unpublished works, press cuttings, photographs, and eyewitness testimony.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

Inside a London bookstore, a fireplace that once belonged to the illustrator responsible for a famous set of tarot cards.

A statuesque figure of a feline stands sentry over a ostentatious spiral staircase

A statue for a zoo that was never built.

The first regular high-definition TV transmissions were made from this seemingly out-of-place mast located on one corner of a Victorian-era entertainment venue.

The Underground railway station and its Cubist/Art Deco statue are so evocative of 1920s/30s London that one almost expects to see Poirot on the stairs.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A pristine wildlife habitat against the backdrop of skyscrapers, nicknamed "The World’s Wildlife Capital"

Legend says this sacred tree was a gift from goddess Athena.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

This cul-de-sac off Fleet Street is said to be the place where the infamous Demon Barber made a killing

A beautiful Georgian church alongside the Thames has a crypt in the basement, in which are buried the bodies of the infamous American traitor Benedict Arnold, his wife Peggy, and their daughter Sophia.

A historic and beautiful Art Nouveau chamber in a historic railway station.

This statue honors the groundbreaking writer for being the first female to support herself solely through her writing, as well as her time as a spy

In 2013, historians discovered a hidden room devoted to the art of making royals' hot chocolate.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

The site is dedicated to an investigative journalist whose murder triggered a political uproar that changed Slovakia forever.

A series of bronze circus performers spread throughout a Slovakian shopping center.