This atmospheric museum honors a family who hid Jews during the Nazi occupation of Latvia.

The European Union’s tallest freestanding structure provides radio and television broadcasting to half of Latvia.

A subtle memorial marks where a human chain protested Soviet control in 1989.

A trove of history focused on Marks & Spencer, the British department store.

This petite cutlery factory sits on the foundations of a defunct gasworks.

A headstone notes where the most famous of Robin Hood's legendary Merry Men is reportedly buried.

This iconic Peak District ridge was once one of the busiest roads in medieval Britain.

A former graveyard for Riga’s elite is now a large park with elegant monuments.

In spite of its medieval appearance and name, this building actually dates back to the Industrial Revolution.

One of the oldest cathedrals in the U.K. houses a priceless early manuscript.

A forgotten underground railway once whooshed trams beneath London.

Once thought to be a decorated air shaft, it might just be a castle-shaped folly.

This controversial memorial to the Titanic's captain stands in a peculiar place.

Babe Ruth and others planted saplings for a 1930s tourism campaign. The saplings grew as the area faded.

Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

A unique sculpture park that features the works of several famed artists.

A tiny chapel perched along a 14th-century bridge.

No one knows why this round stone structure was built on a hilltop in Wales.

See an anatomy teaching collection assembled in the 1920s and 1930s.

Malta’s oldest sea water distillation building is now an architectural anomaly on the Sliema waterfront.

A bizarre example of collective behavior resulted in thousands of shoe prints in Vegas parking lots.

One of Amsterdam’s most popular cultural and recreational complexes is on the site of a former gas works.

A plinth outside a church displays sculptures by local artists.

This Las Vegas casino boasts one of only three spiral escalators in the United States—an engineering wonder.