"Holy Wisdom" overlooks the city that became its namesake.

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

The iconic egg tart gets an upgrade with a laminated sourdough crust.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

This striking, historic hotel has major Wes Anderson movie energy.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Hundreds of hidden passageways weave through the old quarters of Lyon.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Picturesque basketball courts sheltered by historical defensive walls and with an enviable sea view.

An ancient knight and a symbol of the city's freedom.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

It's said that visitors can "see" Tasmania inside this cave.

This extraordinary geological oddity resembles human-made pavement.

Three women and a 10-year-old boy are immortalized in this sculpture memorializing the 13,000 women and children convicts sent to Van Diemen’s Land (now Tasmania) between 1803 and 1853.

The world's only full-size replica of the research hut used by Douglas Mawson for his 1911-14 Australasian Antarctic Expedition.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

Every year, a sparkling cave is sculpted in the icy heart of a glacier.

The ruins of the oldest artificial island in Japan, still used for mooring today at 800 years old.

This 1930s train station still gets hundreds of visitors a day despite the fact it only makes a 7-kilometer journey.

For more than a century, this hole-in-the-wall near Termini Station has been serving what some say is the greatest porchetta sandwich.

Royal burial place of the kings of ancient Britain.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.