An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

This lovely pocket park is one of the most under appreciated in D.C.

Obscure Freemasons still live in D.C.’s largest private residence.

The walls of the iconic dome are hollow and have a secret stairway.

When it opened during the final years of the embargo, all the drinks and cigars were free.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.

The United States Capitol's former columns still stand.

This restaurant serves wood-fired fare served in a natural cave with a live spring.

Watch cheese-flipping robots in action at this factory and museum.

Roman ruins, natural methane fires and a lovely beach.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

A Buddhist temple covered in intricate designs and carvings made out of seashells and pieces of coral.

A fantastic castle rumored to be the birthplace of King Arthur.

This Roman theater was crafted into the local tuff rock and was rediscovered during the 19th-century.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

An astounding annual light display honors the victims of one of Japan's most devastating earthquakes.

This restaurant features Native American foods from across the country.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

No passport is required to eat around the world at this elegant restaurant.

Proceeds from this colorful teahouse in a historic Atlanta neighborhood directly fund women’s education in northeast India.

The hot chocolate here all stems from small, sustainable microproducers in Chiapas and Tabasco.