A Spiritualist house of worship where believers communicate with the dead in the spirit world.

The most decorated dog of World War I is preserved in the Smithsonian.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Lost subway station nestled beneath Toronto's busy commuter line.

The world’s largest underground marble quarry is hiding in Vermont.

A gardener's enduring labor of love is spread throughout a small Vermont town.

Driftwood dinosaurs lurk within trees covered in a rainbow array of avian abodes.

The Vermont grave of a 4,000-year-old mummy prince.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A catapult rock from Gotland’s 13th-century civil war is still lodged in Scandinavia's best-preserved medieval city wall.

The dome-shaped reservoir of this old water tower produces unique acoustic effects.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

A Japanese video game arcade hides in the back of a Swedish pool hall.

A botched 18th-century canal silenced one of Sweden's most magnificent waterfalls.

This pyramid in southern Sweden houses the remains of an eccentric nobleman, who spent his life doing whatever he felt like doing.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

A 200-year-old collection of medical paraphernalia in a historic house.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

Frequent fliers welcome in this airplane hotel.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

The library's graceful rotunda is like a bibliophile's temple.