This patch of old-growth forest is home to Canada's gnarliest tree.

By public opinion, this is Canada's knottiest tree.

A monument stands at one of the starting lines of the Trans-Canada Highway, formerly the longest uninterrupted highway in the world.

Saved by a logger, this Douglas fir is one of the last great old-growth trees in Canada.

The colorful, smiling concrete silos of Vancouver.

This historic Victorian hotel has a scandalous history of affairs and murder.

A sculpture serving as an homage to Pope John Paul II.

The former home of an Italian artist is now a shrine to his ambitious works.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This ancient market is often referred to as the oldest shopping mall in the world.

This large, circular tomb is the final resting place of the first emperor of Rome.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

One of Amsterdam’s most popular cultural and recreational complexes is on the site of a former gas works.

Rejoice at Amsterdam's ‘pop temple,’ a former church reborn as a raucous music venue.

A line number in Amsterdam that will likely never be used again due to its tragic history.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.