This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A bit of retro transportation flair preserved in the world's largest department store.

The supreme shrine of the state.

This beautifully historic Bahrain fortress might not be the most popular attraction around, but that might make it all the better.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A massive collection of petroglyphs dating back some 40,000 years.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

This striking icon of the disputed Republic of Artsakh caused a stir at a Eurovision Song Contest.

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

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

Singapore's landscaping project is home to 18 incredible Supertrees.

Hang out with thousands of butterflies in one of the world's largest such enclosures.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Home to three historic ships from the age of Vikings.

An intricately carved Viking church overlooks a glistening fjord.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

This 13th century Gothic brick castle is the largest in the world by surface area.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.