Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Old Danish castle immortalized in Shakespeare's Hamlet.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A stone troll guards the hike that leads to this waterfall.

Decorated by local artists, the city's utility boxes have become three-dimensional canvases.

The intense competition of the 19th-century fur trading industry played out at this fort in Western Canada.

A controversial blue hoop has been puzzling freeway drivers since 2013.

This park straddling the United States-Canadian border has been a symbol of peace since 1932.

An eclectic retreat speckled with whimsical folk art.

A seven-story wooden coal tipple stands this former mine, the last of many that once covered this area.

A herd of colorfully painted bovine statues can be found in the middle of "cowtown."