A tribute to Loveland’s most famous sweethearts, who helped spread cupid’s message to millions.

Rebuilt remains of a temple to Roman god Mithras.

Hidden beneath the streets of London is a secret subway that only carried mail.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The most visited, and possibly most controversial, museum in Germany.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

Colorado's only true geyser is hidden within the San Juan National Forest.

The largest self-built castle in the U.S., six decades in the making.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Notorious artist squat renovated into legal studios.

This peeling mural of Adam and Eve was inspired by the greenhouses at Kew Gardens.

The fences outside some of South London's estates are made from recycled World War II stretchers.

A celebrated bandstand at the center of what was once the worst slum in London.

These morbid carvings remind churchgoers of the inevitability of death.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Historic church where a number of Shakespeare's actors are buried.

London's most popular recording studio, located in the capital's East End, runs partly on solar power and has played host to some of the world's biggest acts.

A monolithic monument in Greater London.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.