A vast Communist-era exhibition space in the Bulgarian capital.

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

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This house is a mosaic of tiled artwork sourced from local artists.

California's largest steel arch bridge.

For over 20 years, Lil Toot has delighted guests with narrated boat rides between Stearns Wharf and Santa Barbara Harbor, becoming a beloved local legend and top-rated experience for visitors.

The home of one of California's most important horticulturalists wilts amidst a lovely park.

One incredible room in the Santa Barbara Courthouse is covered in wall-to-wall canvas murals.

The beautiful behemoth is one of the largest trees of its kind in the United States.

Hidden in the Santa Ynez Mountains off Highway 154, this tiny restaurant once served as a stagecoach stop.

Acres of natural wonders left behind by a socialite-turned-gardener.

A remnant of Korea's colonial past lies forgotten in a hip neighborhood in Seoul.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Mumbai's angel.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

Kenyan restaurant is a carnivore's paradise, serving exotic meats at its ultimate 'Beast of a Feast.'

Located in Nairobi National Park, this animal orphanage is the oldest of its kind in Kenya.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

This restored 17th century synagogue is one of the few remaining structures in Morocco’s ruined Jewish quarters.

The designated Jewish quarter in Fez dates back to the 15th century.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.