St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

These engineering masterpieces are a dominant feature of the Belfast skyline.

This hidden museum examines the complex history of the country's law enforcement.

Celebrated in poem, this tiny hidden cemetery has a big and grisly history.

Belfast's namesake river still winds below the city center, hidden from sight.

The last Victorian market in Belfast.

This small sculpture honors a shuttered bookshop that was the site of a fiery act of protest.

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

Equipped with thousands of LED lights, this geodesic dome-shaped stadium is an engineering delight.

Somewhat controversial when first unveiled, this gathering of sea creatures has become a hidden gem.

A unique underground car park that has become a popular filming location.

This historic tall ship traveled 1.5 million miles around the globe, and once did duty as the mythical pirate ship in Peter Pan.

The 18th-century home was disassembled into 253 cases and brought all the way from the other side of the world.

A remarkable lifelong collection of antiques and art preserved in a historic Melbourne townhouse.

The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers.

The word 'wunderkammer' translates as 'wonder-chamber'. This Wunderkammer is both a museum and a retail store.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

Clusters of abandoned buildings hint at the facility's 144-year history with psychiatric health.

Now a public art piece, this curious metal feature originally advertised a tinsmith's services.

A contemporary fresco movement illustrates the region's rich history.

The floating gallery illuminates the heart of Québec City's arts district.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The Burnside Fountain and its questionable interpretation.