Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A massive marble foot is tucked away in a small alley near the Pantheon.

A statue representing a lost Roman profession that was vandalized for centuries.

A forgotten "city of water" underneath the famous Trevi district.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Its interior is adorned with some of the best examples of early Christian mosaics.

An alchemist's “magic door” stands in the middle of a Roman park.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A touching tribute to the "Wonky Donkey."

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

The giant birds honor two native North American species.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

One of the largest underground systems runs under Canada's largest urban center.

A small and quirky museum hidden inside a fence.

This 20-foot-tall sculpture is in honor of the herd of bighorn sheep that call Radium Hot Springs home.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

Nestled near the mountains of western Canada resides this behemoth earth mover.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Try the alligator at this fondue spot, which has been catering to "lovers and hedonists" since 1967.

The natural hot spring that was integral to the creation of Canada's first national park.

Historic site where Native American hunters once trapped and killed buffalo.

Despite being dead since the 1970s, this Canadian tree is kept upright and intact by adoring locals.