A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

A standing relief of a Norman knight whose posture marks him as a Crusader.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

A hugely vast Irish landscape of barren rock that stretches for miles.

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

The oldest licensed distillery in Ireland.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

Just another ancient, mysterious Irish stone circle.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

These imposing walls and towers look more like the ruins of a fortress than a monastery.